Loom stop motion



Feb. 20, 1940. 1.. M. r1oGERs 2,191,413

LOOM STOP MOTION Filed April 5, 1959 INVENTOR. ZEONAED /7. E0 cases.-

ATTORNEY.

Patented Feb. 20, 1940 UNITED STATES LooM STOP MOTION Leonard M; Rogers, Mendon, Mass, assignor to Draper Corporation, Hopedale, Mass, a corporation off-Maine Application April 5, 1939, Serial No. 266,125

2 Claims.

The present invention pertains to center filling fork stop motions for looms and more particularly relates to the fork lifting means of such stop motions.

Stop motions of the type to which my inven-. tion applies commonlyinclude a center filling fork carried by the loom lay, an actuating rod and a fork lifting cam carried by therod. The actuating rod moves, commonly longitudinally, and the lifting cam has a cam surface for lifting the filling fork when the rod moves in one direction. The lifting cam also has a stop shoulder cooperating with the filling fork to restrain movement of the actuating rod in the opposite direction upon filling failure. The stop motion includes means for stopping the loom when the actuating rod is thus restrained. The fork lifting cam must be very accurately positioned upon the actuating rod, to insure raising and lowering of the filling fork at exactly the right times in each cycle of movement and to insure engagement of the stopshoulder upon detection by the fork of filling failure. 1

In stop motions of the type described, the cam surface of the fork lifting cam is subject to wear which destroys its accuracy and thus requires its renewal at intervals. In prior constructions, the fork lifting cam was made in one piece, so that when the came surface became worn the cam was removed and discarded and a new cam mounted on the actuating rod. Adjusting and rying this new cam until it is found to be positioned in exactly the right place is a time-consuming operation and diflicult .to perform when the looms are installed in a mill. I

A principal object of the present invention is to provide a center fork stop motion having a center fork, actuating rod and fork lifting cam having a cam surface and stop shoulder as aforesaid,

wherein such cam shall be made in two pieces stop, whereby the cam portion when worn may be replaced by a new one and the aforementioned.

adjusting operation is thereby eliminated.

The foregoing and other objects of the invention are accomplished in the construction illustrated on the accompanying drawing, of which:

Fig. 1 is a view in elevation of part of a loom lay and center fork stop motion having the preferred embodiment of my invention applied thereto; V

Fig. 2 is a detail view, to a larger scale, showing the preferred fork lifting cam of Fig. 1;

Fig. 3 is an end view of said cam; and. Figs. 4 and 5 are perspective views showing, respectively, the cam portion and the hub portion" of said cam.

' not shown, is picked from side to side of the loom along the lay beam l in the usual manner to lay picks of filling thread. The presence or absence ,20 of the filling thread is detectedby a filling fork 5 and upon detection by the fork of absence of filling thread the aforesaid stop motion is actuated to effect stopping of the loom.

The filling fork 5 includes tines 6 which are .25 fixed in a hubwhich in turn is fixed upon a shaft l. The shaft l is pivoted in bearings in a bracket 8 which is fixed to the front of the lay beam l. Upon turning of the fork 5 and its shaft 1 in one direction, the tines ii are raised above the 30 path of the shuttle. The fork is raised positively,but is lowered, after the shuttle has passed,

'by gravity assisted by a Spring The filling the art. 35

The stop motion parts for raising the filling fork, 5 and for effecting loom stoppage include a bell crank lever l0 which is pivoted at H to a plate l2 fixed on the front of the lay beam I.

A vertical arm l3 of the lever Ill carries a for- 0 wardly extending bunter It. The lever is rocked,

to move the hunter I4 toward the left, by a vertically moving cam follower l5 carrying a collar 16 for engagement with a horizontal arm of the lever 10. The lever is rocked in the opposite direction, to move the hunter 14 toward the right, by a spring H. An actuating rod I8 is pivoted at one endto the arm l3 and has its other end slidablymounted in the bracket 8, whereby such rod reciprocates longitudinally of the lay beam.

The particular stop motion parts thus far described are like the corresponding parts disclosed in patent to Lindsjo, No. 1,865,930- granted July 5, 1932. H Y My improved fork lifting cam isfixedto the u actuating rod l8. This cam consists of a hub portion I9 fixed to the rod l8 as by set screws I9 and a cam portion fixed to the hub portion l 9, as hereinafter described. The cam portion 20 has a cam surface 2|, 2! which is interrupted by a stop shoulder 22. An arm 23 on the shaft 1 is operated by the cam surface 2!. When the actuating rod I8 is moved toward the left the cam surface 2| raises the tines B of the filling fork to allow the shuttle to pass. Immediately after the shuttle has passed, the rod is moves toward the right, to thereby lower the filling fork. If the fork tines encounter and rest upon a filling thread, the arm 23 will be held out of engagement with the shoulder 22. However, if no filling thread is present the fork will drop rapidly enough to engage the arm 23 against stop shoulder 22, thereby restraining further movement of the actuating rod toward the right and effecting loom stoppage in the same manner as in the said Lindsjo patent.

The cam surface 2! and stop shoulder 22 must be positioned very accurately, to insure proper cooperation with the filling fork. This cam surface is also subject to wear, so that it must be replaced periodically. It will be apparent that replacing the entire cam would include dismantling the stop motion and performing the difficult task of adjusting the new cam after it is installed. For these reasons, I make the cam in two pieces so that only the cam portion 2i! need be replaced. In addition to making the cam portion 20 detachable from the hub portion I9, I

have also provided the respective portions with accurately formed cooperating positioning elements so arranged that the cam need not be readjusted when a new portion 29 is installed.

,In the particular embodiment shown, the hub portion H] has approximately radial faces 24 26 and recess 21 are accurately formed with predetermined relation to the cam surface 2| and stop shoulder 22. The hub portion I9 is fixed to the actuating rod I8 in predetermined position, that when a new cam portion is to be installed the tongue 26 and recess 21 position such new portion properly with relation to the filling fork and any necessity for re-adjusting the cam is thereby eliminated.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. In a center fork stop motion for looms, the combination of a center filling fork, a longitudinally moving actuating rod, and a'two piece fork lifting cam, said cam comprising a hub portion fixed to said rod in predetermined position thereon and a cam portion removably fixed to said hub portion, said cam portion having a cam surface for lifting said fork upon movement of said rod in one direction and a stop cooperating with said fork to. restrain movement of said rod in the other direction upon filling failure, one of said portions having a tongue engaging in a recess formed in the other of said portions, said tongue and recess being accurately formed in predetermined position relative to said cam surface and stop to thereby accurately position said cam surface and stop with relation to said hub portion.

2. A filling fork cam for a center fork stop motion of the class described, said cam comprising a hub portion adapted to be fixed in predetermined position on a longitudinally moving fork actuating rod, a cam portion having a cam s1u-face interrupted by a stop shoulder, and means for detachably securing said cam portion to said hub portion, one of said portions having a tongue engaging in a recess formed in the other of said portions, said tongue and recess being accurately formed in predetermined position relative to said cam surface and stop shoulder whereby said cam portion may be replaced by a similar accurately formed cam portion without any necessity for adjusting said hub portion on said rod.

LEONARD M. ROGERS. 

